JPS5834283Y2 - York valve return timing warning device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a choke valve return timing warning device for an internal combustion engine equipped with a manually operated choke pulp.

Generally, when starting an internal combustion engine, a choke valve is closed to enrich the air-fuel mixture in order to improve startability.

However, if the choke valve is manually operated,
Even after engine warm-up, some people forget to return the choke valve to the open position, resulting in incomplete combustion, which increases fuel consumption and causes air pollution.

A long time ago, a conventional example of achieving this kind of purpose was:
Some models use temperature-sensitive switches, but because the heat source is sourced from the engine's cooling water or from the exhaust gas, the heat source reaches the water jacket of the cylinder block or cylinder head. A temperature-sensitive switch is installed, or a similar switch is installed in the exhaust system.

Therefore, special processing is required for the engine body and exhaust system parts, and furthermore, there are drawbacks such as the length of the wiring.

In addition, automatic return devices for choke knobs, etc., use bimetal as a means of measuring the return timing (
For example, Utility Model Application Publication No. 52-106733, Japanese Patent Application Publication No. 53-33
No. 2) is known, but these control the energization of the bimetal heater using a power switch (key switch) and a choke switch, so the timing at which energization starts depends on when the engine starts (i.e. This did not match the warm-up start time) and was extremely inaccurate.

In view of this, the present invention uses a simple structure to notify the driver when it is time to return the choke valve.

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

FIG. 1 is a circuit diagram of this embodiment, and shows a heating circuit 1 in which a heating heater 2 and a choke switch 3 are connected in series.
and an alarm circuit 4 consisting of an alarm 6 and a temperature-sensitive switch 7 connected in series, and the G-0 terminal A of the heating circuit 1 is connected to a point where the voltage is at a high level during engine operation, such as a voltage regulator. It is connected to the L terminal of the alternator or the neutral terminal of the alternator.

FIG. 2 is a sectional view showing an example of a concrete implementation of the circuit shown in FIG. 1.

In FIG. 2, reference numeral 10 is a knob for opening and closing a choke valve (not shown), and is attached to an instrument panel or the like through a housing 15 so as to be movable forward and backward.

The shaft portion 10a of the knob 10 is made of an insulating material such as plastic, and as shown in the figure, a conductor 11 is integrally provided in a portion thereof.

A cable 12 is connected to the shaft portion 10a, and the other end (not shown) is connected to a choke valve.

Reference numeral 9 is a bimetal and constitutes a temperature-sensitive switch 7 together with a conductor 11, and when heated by the heating heater 2 to a predetermined temperature or higher, its tip 9a comes into contact with the shaft portion 10a of the knob c, 13, 14. Both are metal balls pressed against the shaft portion 10a of the knob by springs.

The metal ball 13 is conductively coupled to one end of the heater 2 via a spring, and constitutes the choke switch 3 with the conductor 11.

Further, the metal ball 14 always maintains contact with the conductor 11 and grounds the conductor 11 via a spring.

The operation of the above configuration will be explained.

When starting the engine, the operator pulls knob 10 in the direction of arrow C in FIG. 2 to close the choke valve.

When the button is pressed in this state, the metal ball 13 and the conductor 11 come into contact as shown in FIG. 3, and the choke switch 3 shown in FIG. 1 is closed.

Next, when the engine starts, voltage is generated at terminal A, current flows through heater 2, and heats bimetal 9.

That is, the timing at which power supply to the heater 2 starts coincides with the timing at which the engine starts.

When heated at a predetermined temperature, the knob comes into contact with the shaft 10a, but after the heating heater 2 starts energizing, the bimetal 9 comes into contact with the shaft 10a. The capacity of the heater 2 and the characteristics of the bimetal 9 are selected in advance through experiments so that the temperature is appropriate.

When the bimetal 9 comes into contact with the shaft portion 10a, that is, the conductor 11, the temperature-sensitive switch 7 shown in FIG. 1 is closed, and the alarm 6 lights up to warn the driver that it is time to return the choke valve.

As a result, when the driver pushes the choke knob back to the position shown in FIG. 2, the contact between the metal ball 13 and the conductor 11 is broken, and the electricity to the heater 2 is removed, so the bimetal 9 returns to the initial cut state. The alarm 6 turns off.

At this time, depending on the characteristics of the bimetal 9 itself, there may be a slight delay in its recovery, but if this becomes an obstacle, even if the bimetal is returned to the body 10a when the knob is returned as shown in Figure 2. Even in the abutting state, the structure may be such that there is no contact with the conductor 11.

In the past, when the A terminal was connected to the L terminal of the voltage regulator, taking advantage of the fact that it was grounded before starting the engine, a diode 8 was installed at the position shown by the dotted line in Figures 1 and 2. By inserting the alarm, the alarm is energized during step 1 after the ignition switch 5 is closed and the engine is started, so it is also possible to check whether the lamp is blown out.

As described above, according to the present invention, it is possible to warn when it is time to return the choke valve with a very simple circuit configuration without the need for special processing on the engine side. It is possible to prevent financial damage from occurring.

Furthermore, since the main parts of the circuit can all be configured in one place, it has extremely excellent features such as low cost, short wiring, and easy maintenance and inspection.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention, FIG. 2 is a sectional view of a main part of a concrete configuration, and FIG. 3 is an explanatory diagram of operation. 1... Heating circuit, 2... Heating heater, 3... Choke switch, 4... Alarm circuit, 6... Alarm,
7... Temperature-sensitive switch, 10... Knob.

Claims (1)

[Scope of utility model registration request] A heating circuit is formed by connecting a series circuit of a choke switch and a heating heater, which are closed by manual displacement to close the choke valve, to a point where voltage is generated only during engine operation, and an alarm and the heating heater. A choke valve return timing alarm device consisting of an alarm circuit connected in series with a temperature-sensitive switch activated by heat.